For my purposes, I'll stick with Flot since its free of licensing fees (at least as far as I can tell). But if I had a budget to work with, Highcharts is appealing.
I wish it was more affordable too. I believe it was only $100 a couple of years ago. That was almost OK as a price to try it out, but the current pricing puts it out of my range for now.
It's lowest price is $80 but doesn't include a developer license (another $360) and only can be used on a "simple webpage" not a web application. The last part is confusing. What exatcly does it mean by "simple webpage"? Does it mean a static web page? If I'm building a ecommerce website, I guess I can't use it?
For my purposes, I'll stick with Flot since its free of licensing fees (at least as far as I can tell). But if I had a budget to work with, Highcharts is appealing.